19
Sequence of Operation / Settings
•
Master / Slave switch:
Master
•
Priority Switch:
OFF
•
Remote Enable Switch:
OFF
•
Exercise Switch:
OFF
•
Post Purge Zone 1 Switch:
OFF
•
Status During Priority Jumper:
OFF
•
A demand occurs from any thermostat closing
R to W. The “PUMP ON” LED illuminates for
the corresponding zone.
•
ZSR control sends 120 VAC to corresponding
zone pump and the primary pump output.
The control will close the X X contacts to signal
the boiler of a demand.
•
When the demand from the last thermostat
calling is satisfied (thermostat opens R to W),
the X X contacts are opened and the “PUMP
ON” LED turns off. The 120 VAC to the zone
pump and primary pump outputs are dropped.
Description of terminals
= Ground
N
= Neutral (Common leg of 120 VAC)
L
= Line (Hot leg of 120 VAC)
Thermostat terminals
R = 24 VAC
W = Heat call
C = Common of 24 VAC
Boiler terminals
XX
= Dry contact rated up to 120 VAC, 2 Amps,
which is typically connected to TT on boiler control,
closes when any zone calls including priority.
ZONE 1 E/S
= Dry contact rated up to 120 VAC, 2
Amps, will close with any call to ZONE 1. Zone 1
can be enabled as a priority zone, typically used for
heating domestic hot water. The ZONE 1 E/S can
be used to close a DHW contact on boiler controls
equipped with these features.
AUX
= Dry contact,
rated up to 120 VAC, 2 Amps, close when any zone
calls and can be used
as signal to a variable speed
self regulated pump or other controls.
Dip switch description
Master / Slave:
allows for unlimited expansion to
additional ZVR or ZSR relays. Only one Master.
Priority ON / OFF:
When priority switch is ON, upon
demand to TSTAT 1, ZONE 1 will operate as priority and
all other zones are temporarily switched off (with 1 hour
time-out). When priority is OFF, any zones that were
active when ZONE 1 was switched on will remain on.
Remote Enable ON / OFF:
When remote enable
mode is ON, the board will hold off all zones waiting
for an external 24 - 120 VAC voltage from the boiler.
Exercise ON / OFF:
When exercise mode is ON,
each circulator is switched on for 30 seconds
following 72 hours of inactivity.
Post Purge Zone #1 ON / OFF:
When post purge is
ON, Zone 1 pump continues operating for 2 minutes
after the priority zone is switched OFF.
WARNING:
NEVER CONNECT R & C DIRECTLY,
this will be a direct short on the 24 VAC supply
Summary of Contents for Z-one ZSR101 Series
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